Comparison of stimulus rivalry to binocular rivalry with functional magnetic resonance imaging
Comparison of stimulus rivalry to binocular rivalry with functional magnetic resonance imaging
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DOI：
10.1167/15.14.2
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发表时间：
2015-01-01
影响因子：
1.8
通讯作者：
Mendola, Janine D.
中科院分区：
文献类型：
--
作者：
Buckthought, Athena;Fesi, Jeremy D.;Mendola, Janine D.
当向每只眼睛呈现不兼容的图像时，就会发生一种称为双眼竞争的现象，其中观看者的有意识视觉感知在两个图像之间交替。在刺激竞争中，即使在眼睛之间快速交换图像的过程中，竞争图像之间也会发生类似的感知变化。在这里，我们使用功能磁共振成像来直接比较两种感知竞争背后的大脑活动。总的来说，我们发现双眼竞争的活动总是比刺激竞争的活动更强、更广泛——在被动观看条件下更是如此。特别是，右上顶叶皮层和右颞顶叶交界处显着参与被动双眼竞争。虽然两种类型的竞争在主动任务期间都涉及较高层的视觉区域，例如腹侧颞叶皮层，但早期视觉区域 V1 至 V3 的刺激竞争活动相对较弱，可能是由于眼内和眼间抑制导致的前馈信号较弱，可能会降低有效对比度。总之，即使没有执行任务，只有双眼竞争才能产生生动的感知交替、早期视觉皮层的激活增加以及背流区域的协调参与。这些发现有助于描述刺激竞争如何适应双眼竞争的分层模型。
When incompatible images are presented to each eye, a phenomenon known as binocular rivalry occurs in which the viewer's conscious visual perception alternates between the two images. In stimulus rivalry, similar perceptual alternations between rival images can occur even in the midst of fast image swapping between the eyes. Here, we used functional magnetic resonance imaging to directly compare brain activity underlying the two types of perceptual rivalry. Overall, we found that activity for binocular rivalry was always stronger and more widespread than that for stimulus rivalry-even more so during passive viewing conditions. In particular, the right superior parietal cortex and the right temporoparietal junction were prominently engaged for passive binocular rivalry. While both types of rivalry engaged higher tier visual regions such as the ventral temporal cortex during an active task, activity for stimulus rivalry was comparatively weak in early visual areas V1 to V3, presumably due to a weaker feed-forward signal due to both intraocular and interocular inhibition that may reduce effective contrast. In sum, only binocular rivalry produced perceptually vivid alternations, increased activation of the early visual cortex, and the coordinated engagement of dorsal stream regions, even when a task was not performed. These findings help characterize how stimulus rivalry fits within hierarchical models of binocular rivalry.